Both weeks are great. We started our Jan trips going around the week of the 14th but this year we went the last week to the first week of Feb and the weather was better. Don't know if it was a fluke or not. I know during around the week of the 14th there is usually the marathon, but it doesn't really make it crowded at all. Everything is a walk on just about. And I think you need to watch when Martin Luther King weekend is. I believe it gets busy then. I'm trying to decide if we are going to go the last week of Jan-beginning of Feb or wait a couple more weeks to see if we can test Expedition Everest. LOL